I will be receiving this watch soon. It is a Quadron in a 18 karat white and yellow gold Weber case with the engraved caliber 123 movement. I know the crown is not original, I would like some direction to what the original crowns color and style,

Possibly this one originally had a special "dust proof" crown with a sliding spigot that is held by the case. I have two Quadrons and a Curvex 330 with this type of crown and have seen many more examples. You should check the opening where the stem goes through, which is typically quite large for this type of crown.

There is one caveat though and that is that these are all US produced Wadsworth cases and yours has a Swiss case. One thing is for sure, the thickness of the crown should be reduced by half...

Images are seller's pictures of my watches. Haven't had the time to do better ones, but I think you'll get the picture.

The dustproof crowns won't work with these cases. The opening is quite a bit smaller. I used to have this model. I used a low profile white crown, large enough in diameter to fill most of that gap. With the white/pink/white layout, I think white sort of continues the motif best. Here's a (not very good) pic of mine:
And Cary's right about those hands. They're not correct. I think the hands and dial on mine were all original. The good news is that this style of hand is pretty common and generic replacements shouldn't be too hard to find. If you can get a pair that fit regardless of color, International will plate them white (rhodium, I think). They even do seconds hands, but yours already looks correct to me. And I'd get the dial redone in pink too.

The watch is 18 karat white and yellow gold. I have read somewhere that the crown on these watches were never solid gold. The more I examine the pictures that were sent, the more I may conclude that the center bezel may be 18 karat rose gold.

What style of hands would be appropriate for this model? I should have the watch in about a week, I will take some pictures and seek additional advice.

If the center bezel is 18 karat rose gold , would the dial color option be pink / salmon color, if so, then the hands would be white I speculate.

I'm almost certain you'll find that it's white and rose gold. And yes, the dial should be salmon colored. The watch I posted is the same model with the original dial and hands. And the hands are white. I'm realizing that my picture is so lousy it's hard to even make out the shape of the hands. I'm borrowing a picture from Cary's Annapolis thread. This is the correct style, although with its small face, your watch would take shorter hands than the Annapolis. It's nice that both hands are the same shape. I always find that locating the usual spade hour hand is much harder than this other style.

Thank you for the tips. It regards to the hands. Where might be a good place to start looking for a pair. It sounds as if ID will be doing a dial refinish in salmon and they could rhodium plate the replacement hands at the same time. In addition, would the salmon colored dial be the same exact style?

It looks to me like the print on your dial is correct. I'm assuming that's just distortion from an old ill-fitting or warped plastic crystal causing it to look out of square. But the configuration is right.
As to a source for hands, I don't really know. If it were me, I'd check with any watchmakers you deal with, supply houses (Otto Frei or Jules Borel come to mind) or eBay sellers who have a lot of hands and explain what you need. I don't know what those are really called. I've seen dart, plume, spade and other names used. But they're definitely a common style. If you can provide hole sizes (60 for minute and 120 for hour, IIRC) and length from hole center to tip, somebody should have them. I can try to look among my parts, but I'm honestly not very good about digging up stuff like this.